Digital BW, The Print

This is because you are laying down different dither patterns (the 
piezo plugin vs the epson driver) not because the black gets dilluted 
with one of the other inks. It is probably also dependent on which 
profile you are using (maybe, I don't know)

-mikeH


> Try this. Create a new blank file in Photoshop. Draw a 1" to 2" to 
> one side and fill it with 100% black. Now print the file using the 
> Epson driver. In the driver choose "Black" rather than color so that 
> only the ink in the black cartridge will be used. Print this out.
> 
> Now move the black square to the other side of the file space and 
> export the image to the Piezo driver and print using an appropriate 
> profile.
> 
> If you take a look at the result, the black ink only square is a bit 
> darker than square using the Piezo driver. tI looks to me that Piezo 
> does run one or more of the other inks into the pure black area but 
> this results in a lower Dmax. I is as if the pigment in the other 
> inks are lighter and the resulting mix is then lighter than pure 
> black.
> 
> Martin